Energies is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. • Energy Fundamentals Thermodynamics Energy forms Heat Energy transformation Mechanical energy Blue energy Internal energy Energy quality Energy density Energy flow • Primary Energy Sources Fossil: Coal, Gas, Nuclear, Oil Renewable : Geothermal, Hydraulic, Ocean, Solar Thermal, Solar Photovoltaic, Solar High-T, Wind • Secondary Energy Sources and Energy Carriers Biomass and Biofuels Hydrogen Liquified Natural Gas Microwave Energy conversion Waste-derived fuels • Energy Exploration and Exploitation • Intermediate and Final Energy Use: Energetic materials Energy storage Power supply Distributed generation Energy and Buildings Power Transmission Energy Infrastructure • Energy Conversion Systems Combustion: Conventional and Advanced Thermal Engines Boilers Heat Exchangers Electric-, Hybrid- and Hydrogen Vehicles Alternative Energy Vehicles Electricity Generation Power Plants Co- and Trigeneration Energy Cascading Domestic and Industrial Applications Aeronautical and Aerospace Energy Systems • Energy Policy Energy Saving and Efficiency Energy conversion and management Environmental Effects Energy and Environmental Indicators Sustainable Energy Systems "Green" energy • Exergy • Energetics Bioenergetics Chemical Energetics Energy in Physical Cosmology • Energy Research and Development